HRESULT DDRVAL;
DDRVAL = lpBackBuffer-> Bltfast (0, 0, LPDDsone, & RC, DDBLTFAST_WAIT); // Background Bit map is sent to the background buffer
IF (DDRVAL! = DD_OK)
{
MSG ("BLT FAILED! Err = 135971476", DDRVAL);
Return;
}
DDSURFACEDESC DDSD, DDSD2;
ZeromeMory (& DDSD, SIZEOF (DDSD));
Ddsd.dwsize = sizeof (ddsd);
ZeromeMory (& DDSD2, SIZEOF (DDSD2));
DDSD2.DWSIZE = SizeOf (DDSD2);
DDRVAL = LPBACKBUFFER-> LOCK (NULL, & DDSD, DDLOCK_WAIT, NULL); // Lock Bar Buffer
IF (DDRVAL! = DD_OK)
{
MSG ("Lock Failed"); // Locking Taiwan buffer failed, exiting the program
Postmessage (WM_CLOSE);
Return;
}
DDRVAL = LPDDSTWO-> LOCK (NULL, & DDSD2, DDLOCK_WAIT, NULL); // Locks the surface of the foreground bitmap
IF (DDRVAL! = DD_OK)
{
MSG ("Lock Failed");
Postmessage (WM_CLOSE);
Return;
}
Byte * bitmap = (byte *) DDSD.lpsurface; // Get the starting point position of the background bitmap in memory
BYTE * bitmap2 = (byte *) DDSD2.lpsurface; // Get the starting point position in the inner memory
Int alpha;
INT POS, POS1;
Static Double Rate1 = 0.05, Rate2 = 0.0;
IF (Rate1> 1.0) Rate1 = 0.0;
Rate2 = 1.0-rate1;
For (int y = newRect1.top; y <= newRect1.bottom; y )
{// newRect1 is the CRECT object, store the display position of the foreground bitmap in the screen
POS = NewRect1.Left * 4 y * DDSD.LPITCH;
POS1 = (Y-NewRect1.top) * DDSD2.LPITCH;
For (int x = newRect1.Left; x <= newRect1.right; x )
{
// red
Alpha = (int) Bitmap2 [POS1] * RATE1;
Bitmap [POS] = (int) Bitmap [POS] * Rate2 Alpha;
IF ((int) Bitmap [POS]> 255) Bitmap [POS] = 255;
POS ; POS1 ;
// Green
Alpha = (int) Bitmap2 [POS1] * RATE1;
Bitmap [POS] = (int) Bitmap [POS] * Rate2 Alpha;
IF ((int) Bitmap [POS]> 255) Bitmap [POS] = 255;
POS ; POS1 ;
// blue
Alpha = (int) Bitmap2 [POS1] * RATE1;
Bitmap [POS] = (int) Bitmap [POS] * Rate2 Alpha;
IF ((int) Bitmap [POS]> 255) Bitmap [POS] = 255;
POS ; POS1 ; // Reverse
POS ; POS1 ;
}
}
Rate1 = 0.05;
LPBACKBUFFER-> Unlock (& DDSD); // Unlock surface
LPDDSTWO-> UNLOCK (& DDSD2); // Unlock surface
CGAMewWnd :: flip (); // Turning surface
